tf2unusual found 2 of these

1st:

http://www.tf2outpost.com/trade/5825969 Traded for 3 Buds + BMOC (1 month away, worth 21 keys back then)

Current owner never had it up for offers

2nd:

Latest trade was this http://www.tf2outpost.com/trade/6878405 . Owner is currently SR banned, might be why he was asking for just 3 Buds (or not)

Worth noting that Prodigy did own the hat previously, but the guy he sold it for was the 1st owner up there, which clearly traded for 3.something Earbuds, not 6.

Previous owner:

http://www.tf2outpost.com/trade/6147051 had offers of unusuals worth around 3 Buds, rejected them. Uncertain what he sold for.

Previous previous owner:

http://www.tf2outpost.com/trade/5967004 Wanted 5 Earbuds, can't be certain what it was sold for

Previous previous previous owner:

http://www.tf2outpost.com/trade/5856942 Also wanted ~5 Earbuds. Offer was ~3.5

First owner:

http://www.tf2outpost.com/trade/5776712 Claimed to have offers of 3 Buds pure, sold for this http://www.tf2outpost.com/trade/6318724 (apart from this Earbuds http://www.tf2outpost.com/trade/5833351 can't be certain if more sweets/other unusuals were involved)